Option variable
nolabelsDefault value: false
When nolabels is true,
input and output result labels
(%i and %o, respectively)
are displayed,
but the labels are not bound to results,
and the labels are not appended to the labels list.
Since labels are not bound to results,
garbage collection can recover the memory taken up by the results.
Otherwise input and output result labels are bound to results,
and the labels are appended to the labels list.
Intermediate expression labels (%t) are not affected by nolabels;
whether nolabels is true or false,
intermediate expression labels are bound and appended to the labels list.